You can check the corresponding loan bank in official website, log in to the online banking with the repayment account number and password, and then click My Loan. You can see the corresponding loan contract number in the loan interface that appears. Taking ICBC as an example, the method for querying the loan contract number is as follows:

1. Enter ICBC on Baidu, find its official website, and click Enter.

2. After entering the bank official website, click the personal online banking login button to enter.

3. Enter the repayment account number and password of the loan in the login interface that appears, and click Login.

4. After the page jumps, log in to the online banking background and click the loan button at the top.

5. At this time, click My Loan in the page that appears to enter.

6. After the page jumps, you can see the previous related loans, and click the details button to enter.

7. You can see the contract number of the loan in the loan details interface that appears.